[mutter] Use gdk_window_get_background_pattern() to clear the background

[Florian Müllner <fmuellner src gnome org>]

commit 0839c100c08932fdedacb7ceb43783431d5d3b6c
Author: Florian Müllner <fmuellner gnome org>
Date:   Mon Aug 16 19:20:44 2010 +0200

    Use gdk_window_get_background_pattern() to clear the background
    
    gdk_window_get_back_pixmap() and gdk_window_get_background() have
    been removed/deprecated. Use gdk_window_get_background_pattern()
    as replacement.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=626583

 src/gdk-compat.h |   17 ---------------
 src/ui/frames.c  |   60 +++++++++++++++++++++++++++++++++++++++++------------
 2 files changed, 46 insertions(+), 31 deletions(-)
---
diff --git a/src/gdk-compat.h b/src/gdk-compat.h
index 236efab..31991e8 100644
--- a/src/gdk-compat.h
+++ b/src/gdk-compat.h
@@ -11,24 +11,7 @@
 
 #if !GTK_CHECK_VERSION (2, 21, 1)
 
-#define gdk_window_get_background(w,c)    *c = GDK_WINDOW_OBJECT (w)->bg_color
 #define gdk_visual_get_depth(v)           GDK_VISUAL(v)->depth
-#define gdk_window_get_back_pixmap(w,p,r)                           \
-  G_STMT_START {                                                    \
-    GdkWindowObject *priv = GDK_WINDOW_OBJECT (w);                  \
-                                                                    \
-    if (p != NULL)                                                  \
-      {                                                             \
-        if (priv->bg_pixmap == GDK_PARENT_RELATIVE_BG ||            \
-            priv->bg_pixmap == GDK_NO_BG)                           \
-          *p = NULL;                                                \
-        else                                                        \
-          *p = priv->bg_pixmap;                                     \
-      }                                                             \
-                                                                    \
-    if (r != NULL)                                                  \
-      *r = (priv->bg_pixmap == GDK_PARENT_RELATIVE_BG);             \
-  } G_STMT_END
 
 #endif /*GTK_CHECK_VERSION */
 
diff --git a/src/ui/frames.c b/src/ui/frames.c
index 27a5381..5ec5b3a 100644
--- a/src/ui/frames.c
+++ b/src/ui/frames.c
@@ -2004,32 +2004,64 @@ meta_frames_destroy_event           (GtkWidget           *widget,
   return TRUE;
 }
 
+#if !GTK_CHECK_VERSION(2,21,6)
+/* Copied from GDK */
+static cairo_pattern_t *
+gdk_window_get_background_pattern (GdkWindow *window)
+{
+  GdkWindowObject *private = (GdkWindowObject *) window;
+  cairo_pattern_t *pattern;
+
+  g_return_val_if_fail (GDK_IS_WINDOW (window), NULL);
+
+  if (private->bg_pixmap == GDK_PARENT_RELATIVE_BG)
+    pattern = NULL;
+  else if (private->bg_pixmap != GDK_NO_BG &&
+           private->bg_pixmap != NULL)
+    {
+      static cairo_user_data_key_t key;
+      cairo_surface_t *surface;
+
+      surface = _gdk_drawable_ref_cairo_surface (private->bg_pixmap);
+      pattern = cairo_pattern_create_for_surface (surface);
+      cairo_surface_destroy (surface);
+
+      cairo_pattern_set_extend (pattern, CAIRO_EXTEND_REPEAT);
+      cairo_pattern_set_user_data (pattern,
+                                   &key,
+                                   g_object_ref (private->bg_pixmap),
+                                   g_object_unref);
+    }
+  else
+    pattern =
+        cairo_pattern_create_rgb (private->bg_color.red   / 65535.,
+                                  private->bg_color.green / 65535.,
+                                  private->bg_color.blue / 65535.);
+    }
+
+  return pattern;
+}
+#endif
+
 static void
 setup_bg_cr (cairo_t *cr, GdkWindow *window, int x_offset, int y_offset)
 {
   GdkWindow *parent = gdk_window_get_parent (window);
-  GdkPixmap *back_pixmap;
-  gboolean parent_relative;
+  cairo_pattern_t *bg_pattern;
 
-  gdk_window_get_back_pixmap (window, &back_pixmap, &parent_relative);
-  if (parent_relative && parent)
+  bg_pattern = gdk_window_get_background_pattern (window);
+  if (bg_pattern == NULL && parent)
     {
       gint window_x, window_y;
 
       gdk_window_get_position (window, &window_x, &window_y);
       setup_bg_cr (cr, parent, x_offset + window_x, y_offset + window_y);
     }
-  else if (back_pixmap)
+  else if (bg_pattern)
     {
-      gdk_cairo_set_source_pixmap (cr, back_pixmap, x_offset, y_offset);
-      cairo_pattern_set_extend (cairo_get_source (cr), CAIRO_EXTEND_REPEAT);
-    }
-  else
-    {
-      GdkColor bg_color;
-
-      gdk_window_get_background (window, &bg_color);
-      gdk_cairo_set_source_color (cr, &bg_color);
+      cairo_translate (cr, - x_offset, - y_offset);
+      cairo_set_source (cr, bg_pattern);
+      cairo_translate (cr, x_offset, y_offset);
     }
 }